html,
body{
    padding: 0;
    margin: 0;
}

.fz-16{
    font-size:16px;
}

@for $i from 1 through 30 {
    .fz-#{10 + $i*2} {
        font-size:(10+$i*2) +px;
    }
}

@for $i from 1 through 30 {
    .w-#{10 + $i*2} {
        width: (10+$i*10) +px;
    }
}